Provided by: groff-base_1.22.2-5_amd64 bug


       grotty - groff driver for typewriter-like devices


       grotty [ -bBcdfhioruUv ] [ -Fdir ] [ files... ]

       It is possible to have whitespace between the -F option and its parameter.


       grotty  translates  the  output  of  GNU  troff  into  a form suitable for typewriter-like
       devices.  Normally grotty should be invoked by using the groff  command  with  a  -Tascii,
       -Tlatin1  or  -Tutf8 option on ASCII based systems, and with -Tcp1047 and -Tutf8 on EBCDIC
       based hosts.  If no files are given, grotty reads the standard input.   A  filename  of  -
       also causes grotty to read the standard input.  Output is written to the standard output.

       By  default,  grotty  emits  SGR  escape  sequences (from ISO 6429, also called ANSI color
       escapes) to change text attributes (bold, italic, colors).  This makes it possible to have
       eight different background and foreground colors; additionally, bold and italic attributes
       can be used at the same time (by using the BI font).

       The following colors are defined in tty.tmac: black,  white,  red,  green,  blue,  yellow,
       magenta,  cyan.  Unknown colors are mapped to the default color (which is dependent on the
       settings of the terminal; in most cases, this is black for the foreground  and  white  for
       the background).

       Use  the  -c  switch  to revert to the old behaviour, printing a bold character c with the
       sequence `c BACKSPACE c' and an italic character c by the sequence `_  BACKSPACE  c'.   At
       the  same  time,  color  output  is  disabled.  The same effect can be achieved by setting
       either the GROFF_NO_SGR environment variable or using the `sgr' X command (see below).

       For SGR support, it is  necessary  to  use  the  -R  option  of  less(1)  to  disable  the
       interpretation  of  grotty's old output format.  Consequently, all programs which use less
       as the pager program have to pass this option to it.  For man(1) in particular, either add
       -R to the $PAGER environment variable, e.g.

              PAGER="/usr/bin/less -R"
              export PAGER

       or  use  the  -P  option of man to set the pager executable and its options, or modify the
       configuration file of man in a similar fashion.  Note that with some man(1) versions,  you
       have to use the $MANPAGER environment variable instead.

       grotty's old output format can be displayed on a terminal by piping through ul(1).  Pagers
       such as more(1) or less(1) are also able to display these sequences.  Use either -B or  -U
       when piping into less(1); use -b when piping into more(1).  There is no need to filter the
       output through col(1) since grotty never outputs reverse line feeds.

       The font description file may contain a command

              internalname n

       where n is a decimal integer.  If the 01 bit in n is set, then the font is treated  as  an
       italic  font;  if the 02 bit is set, then it is treated as a bold font.  The code field in
       the font description field gives the code which is used to  output  the  character.   This
       code can also be used in the \N escape sequence in troff.

       If  the  DESC  file contains the keyword unicode, grotty emits Unicode characters in UTF-8
       encoding.  Otherwise, it emits characters in a single-byte encoding depending on the  data
       in the font description files.  See the groff_font(5) man page for more details.


       -b     Suppress the use of overstriking for bold characters.  Ignored if -c isn't used.

       -B     Use only overstriking for bold-italic characters.  Ignored if -c isn't used.

       -c     Use grotty's old output format (see above).  This also disables color output.

       -d     Ignore all \D commands.  Without this grotty renders \D'l...' commands that have at
              least one zero argument (and so are either horizontal or vertical) using -, |,  and
              +  characters.   In  a  similar way, grotty handles \D'p...' commands which consist
              entirely of horizontal and vertical lines.

       -f     Use form feeds in the output.  A form feed is output at the end of each  page  that
              has no output on its last line.

       -Fdir  Prepend  directory  dir/devname  to the search path for font and device description
              files; name is the name of the device, usually ascii, latin1, utf8, or cp1047.

       -h     Use horizontal tabs in the output.  Tabs are assumed to be set every 8 columns.

       -i     Use escape sequences to set the italic text  attribute  instead  of  the  underline
              attribute  for  italic  fonts  (`I' and `BI').  Note that most terminals (including
              xterm) don't support this.  Ignored if -c is active.

       -o     Suppress overstriking (other than for bold or underlined characters in case the old
              output format has been activated with -c).

       -r     Use  escape  sequences  to  set the reverse text attribute instead of the underline
              attribute for italic fonts (`I' and `BI').  Ignored if -c is active.

       -u     Suppress the use of underlining for italic characters.  Ignored if -c isn't used.

       -U     Use only underlining for bold-italic characters.  Ignored if -c isn't used.

       -v     Print the version number.


       grotty understands a single X command produced using the \X escape sequence.

       \X'tty: sgr n'
              If n is non-zero or missing, enable SGR output (this is the default), otherwise use
              the old drawing scheme for bold and underline.


              If  set,  the  old  drawing  scheme  for  bold  and  underline (using the backspace
              character) is active.  Colors are disabled.

              A list of directories in which to search for the devname directory in  addition  to
              the default ones.  See troff(1) and groff_font(5) for more details.


              Device description file for ascii device.

              Font description file for font F of ascii device.

              Device description file for latin1 device.

              Font description file for font F of latin1 device.

              Device description file for utf8 device.

              Font description file for font F of utf8 device.

              Device description file for cp1047 device.

              Font description file for font F of cp1047 device.

              Macros for use with grotty.

              Additional klugdey character definitions for use with grotty.

       Note that on EBCDIC hosts, only files for the cp1047 device is installed.


       grotty is intended only for simple documents.

       There is no support for fractional horizontal or vertical motions.

       There is no support for \D commands other than horizontal and vertical lines.

       Characters above the first line (ie with a vertical position of 0) cannot be printed.

       Color  handling  is  different  compared  to  grops(1).  \M doesn't set the fill color for
       closed graphic objects (which grotty doesn't support anyway) but  changes  the  background
       color of the character cell, affecting all subsequent operations.


       groff(1),  troff(1),  groff_out(5),  groff_font(5), groff_char(7), ul(1), more(1), man(1),